Monday, April 29, 2019

| April 29, 2019 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 29, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

ALMOST CLEAR CONDITIONS THIS MORNING BECOMING
MORE CLOUDY FOLLOWING NOONTIME….

We observed excellent visibility of 85 miles today,
with increasing afternoon clouds. Wind shifted from
NW to SW since this morning, with the speed staying
around 10 mph. Pressure was at a steady decline since
this morning, decreasing about 2 millibars by the 1 P.M.
observation. The high so far today is 57F, 4 degrees below
the daily normal maximum of 61F. The low since midnight
is 34F, 9 degrees below the daily normal of 43F.

BHO Greatest April Precipitation, inches (1885-2019):

1) 10.37 in 1987
2)  9.38 in 2004
3)  8.71 in 1929
4)  8.68 in 2007
5)  8.53 in 1904
6)  7.97 in 2019  (through 7 AM on 4/29)
7)  7.57 in 1935
7.57 in 1983
9)  7.31 in 1901

The calendar day rainfall on Monday, 4/22, was more than
two and a half inches, which made it one of the wettest
calendar days ever observed in April. The finalized
amount for the day will be reported when available.

BHO Greatest April Calendar Day Precipitation, inches (1885-2019):

1) 3.47 on April 1,  2004
2) 3.18 on April 21, 1991
3) 2.63 on April 16, 2018
4) 2.51 on April 24, 1898
2.51 on April 13, 2004
6) 2.45 on April 16, 1929
7) 2.41 on April 28, 1904
8) 2.40 on April 10, 1935

Today’s Observations:

7 A.M.
Weather: Clear, few distant cirrostratus
Temperature: 42F; Dew Point: 33F; Wind: NW at 10G17 kts
Sea-level pressure: 30.38 ins. Hg, rising then more rapidly
Visibility: 80 miles
6-hr Max temp: 42F
6-hr Min temp: 34F
24-hr Precip: 0.08 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 80 288/42/33/3210G17/038/ FEW DSNT CS ALQDS/
8/005 70008 51027 10042 20034

10 A.M.
Weather: Clear, few cirrostratus in all directions
Temperature: 50F; Dew Point: 23F; Wind: NW at 10G20 kts
Sea-level pressure: 30.37 ins. Hg, falling steadily
Visibility: 85 miles
3-hr Precip: 0.00
BHO SA 1455 300 SCT 85 285/50/23/3210G20/037/ 8/005
58003

1 P.M.
Weather: Broken cirrus
Temperature: 57F; Dew Point: 20F; Wind: SW at 10G17 kts
Sea-level pressure: 30.33 ins. Hg, falling steadily
Visibility: 85 miles
6-hr Max temp: 57F
6-hr Min temp: 42F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E250 BKN 85 272/57/20/2410G17/033/ 8/002
55013 10057 20042

SUMMARY FOR SUNDAY, APRIL 28, 2019

TEMPERATURE (DEGREES F)
MAX…..51   NORMAL…..61
MIN…..38   NORMAL…..42
MEAN….45   NORMAL…..52

DEPARTURE FROM 30-YEAR NORMAL……………………-7
TOTAL DEPARTURE FOR THE MONTH…………………..+66 [+2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..20   DEPARTURE………+7
TOTAL HEATING UNITS FOR THE MONTH………….457   DEPARTURE……..-68
TOTAL HEATING UNITS FOR THE SEASON………..5862   DEPARTURE…….-147
TOTAL HEATING UNITS LAST SEASON TO DATE……5653   DIFFERENCE……+209

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 W   AT  1:37 A.M.
AERO…………………….28 W   AT  3:32 A.M.
ASOS…………………….28 W   AT 12:09 A.M.
DAVIS……………………28 W   AT  2:57 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….22 W   AT  2:46 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 W   AT 12:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 W   AT  2:38 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.3 W
ASOS…………………..10.4
DAVIS………………….10.5 WSW [247 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.08  DEPARTURE…….-0.06
ASOS…………..0.07
TOTAL PRECIPITATION FOR THE MONTH……….7.97  DEPARTURE…….+3.68
ASOS…………..7.90
TOTAL PRECIPITATION FOR THE YEAR……….21.01  DEPARTURE…….+2.72
ASOS………….21.01

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………0.0  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH………….TRACE  DEPARTURE……..-3.0
TOTAL SNOWFALL FOR THE SEASON………….47.6  DEPARTURE…….-15.1

PRELIMINARY CLIMATE SUMMARY FOR MARCH CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

04/01 45/29/37/-4/0.00/0.0/748/98           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/…./0.0/605/79           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./0.0/484/63           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/…./0.0/717/93            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/…./0.0/341/44           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/…./0.0/536/69           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/320/41          24 S   AERO 18 S   RMY 25
04/08 48/34/41/-3/0.49/0.0/000/00           25 NE  AERO 20 NE  RMY 26
04/09 40/32/36/-8/0.08/0.0/000/00           23 NE  AERO 16 N   RMY 25
04/10 43/30/37/-8/T/T/000/00                32 NW  AERO 26 NW  RMY 36
04/11 51/29/40/-5/0.00/0.0/403/51           23 NW  AERO 18 NW  RMY N/A
04/12 53/38/46/+1/…./0.0/000/00           35 SSW AERO 29 SSW RMY 39
04/13 71/54/63/+17/…./0.0/167/21          38 SSW AERO 32 SSW RMY N/A
04/14 71/51/61/+15/…./0.0/224/28          25 S   AERO 18 S   RMY N/A
04/15 67/40/54/+7/…./0.0/168/21           46 W   AERO 52 W   RMY 50
04/16 58/37/48/+1/0.00/0.0/…/..           46 W   AERO 44 W   RMY 44
04/17 62/36/49/+2/0.00/0.0/…/..           26 ESE AERO 25 S   RMY 28
04/18 63/39/51/+3/0.00/0.0/…/..           44 S   AERO 44 S   RMY 50
04/19 71/58/65/+17/…./0.0/…/..          47 SSW AERO 51 SSW RMY 52
04/20 68/60/64/+15/…./0.0/…/..          50 SSW AERO 54 SSW RMY 52
04/21 68/51/60/+11/…./0.0/…/..          35 S   AERO 35 S   RMY N/A
04/22 53/45/49/0/…./0.0/…/..            35 NNE AERO 32 NNE RMY 35
04/23 52/44/48/-2/…./0.0/…/..           30 NNE AERO 26 NNE RMY N/A
04/24 65/44/55/+5/…./0.0/…/..           29 WNW AERO 29 WNW RMY 30
04/25 61/39/50/0/0.00/0.0/…/..            22 S   AERO 22 S   RMY 21
04/26 53/42/48/-3/…./0.0/…/..           35 ESE AERO 30 W   RMY 33
04/27 54/39/47/-4/…./…/…/..           41 W   AERO 44 W   RMY 47
04/28 51/38/45/-7/0.08/0.0/…/..           28 W   AERO 28 W   RMY N/A

04/29 Low temp since midnight is 34F; normal low is 43F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010

RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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